<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar class="page-nav-bar" left-arrow title="黑马头条" @click-left="$router.back()"></van-nav-bar>

    <div class="main-wrap">
      <!-- 加载中 -->
      <div v-if="loading" class="loading-wrap">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>

      <!-- 加载完成-文章详情 -->
      <div v-else-if="article.title" class="article-detail">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ article.title }}</h1>

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="article.aut_photo"
          />
          <div slot="title" class="user-name">{{ article.aut_name }}</div>
          <div slot="label" class="publish-date">
            {{ article.pubdate | relativeTime }}
          </div>
          <!-- 模板中的$event是事件参数 -->
          <follow-user
            :is-followed="article.is_followed"
            :user-id="article.aut_id"
            class="follow-btn"
            @updata-is_followed="article.is_followed = $event"
          />
          <!-- <van-button
            v-if="article.is_followed"
            :loading="followLoading"
            class="follow-btn"
            type="info"
            color="#3296fa"
            round
            size="small"
            icon="plus"
            @click="onFollow"
            >关注</van-button
          >
          <van-button
            v-else
            :loading="followLoading"
            class="follow-btn"
            round
            size="small"
            @click="onFollow"
            >已关注</van-button
          > -->
          <!-- <follow-user
          :is-followed="article"
           class="follow-btn"/> -->
        </van-cell>

        <!-- 文章内容 -->
        <div
          ref="article-content"
          class="article-content markdown-body"
          v-html="article.content"
        ></div>
        <van-divider>正文结束</van-divider>

        <!-- 评论组件 -->
        <comment-list
          :source="article.art_id"
          @onload-success="totalCommentCount = $event.total_count"
          :list="commentsList"
          @reply-click="onReplyClick"
        />

        <!-- 底部区域 -->
        <div class="article-bottom">
          <!-- 点击我的评论，让弹框显示 -->
          <van-button
            @click="isPostShow = true"
            class="comment-btn"
            type="default"
            round
            size="small"
            text="写评论"
          >
          </van-button>
          <!-- info更新后变成了bange -->
          <van-icon name="comment-o" :badge="totalCommentCount" color="#777" />
          <!-- <van-icon color="#777" name="star-o" /> -->
          <CollectArticle
            v-model="article.is_collected"
            :article-id="article.art_id"
          ></CollectArticle>
          <!-- <collect-article /> -->
          <!-- 文章点赞 -->
          <!-- <van-icon color="#777" name="good-job-o" /> -->
          <like-article
            v-model="article.attitude"
            :article-id="article.art_id"
          />
          <van-icon name="share" color="#777777"></van-icon>
        </div>
      </div>

      <!-- 加载失败：404 -->
      <div v-else-if="errStatus === 404" class="error-wrap">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div v-else class="error-wrap">
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn">点击重试</van-button>
      </div>
    </div>

    <!-- 发布评论 -->
    <van-popup v-model="isPostShow" position="bottom">
      <!-- 发布评论自定义组件 -->
      <comment-post :target="article.art_id" @post-success="onPostSuccess" />
    </van-popup>

    <!-- 评论回复 -->
    <van-popup v-model="isReplyShow" position="bottom" style="height: 90%">
      <!-- 在页面中使用 comment-reply.vue 组件 -->
      <comment-reply :comment="currentComment" @close="isReplyShow = false" />
    </van-popup>
  </div>
</template>

<script>
import { getArticleById } from '@/api/article.js'
import { ImagePreview } from 'vant'
import followUser from '@/components/follow-user/index.vue'
import CollectArticle from '@/components/collect-article/index.vue'
// 导入 comment-list.vue文章评论组件
import CommentList from '@/views/article/components/comment-list.vue'
// import { addFollow, deleteFollow } from '@/api/user.js'
// 挂载发布评论组件
import CommentPost from './components/comment-post.vue'
// 导入文章点赞
import LikeArticle from '../../components/like-article/index.vue'
// 在父组件中导入，并挂在评论回复组件
import CommentReply from '@/views/article/components/comment-reply.vue'

export default {
  name: 'ArticleIndex',
  components: {
    followUser,
    CollectArticle,
    CommentList,
    CommentPost,
    LikeArticle,
    CommentReply
  },
  props: {
    articleId: {
      type: [Number, String, Object],
      required: true
    }
  },

  // 因为所有的组件都需要使用到 articleId 这个字段信息，如果都采用父子组件传值的方式
  provide: function () {
    return {
      articleId: this.articleId
    }
  },

  data() {
    return {
      // 文章详情
      article: {},
      // 加载中的 loading
      loading: true,
      // 失败的状态码
      errStatus: 0,
      // 关注和取消关注的loading 状态显示与否
      followLoading: false,
      // 评论总数量变量
      totalCommentCount: 0,
      // 声明 isPostShow 属性控制发布评论的显示状态
      isPostShow: false,
      commentsList: [],
      // isReplyShow来控制展示回复弹层的显示状态
      isReplyShow: false,
      // currentComment 属性，用来接收评论项数据
      // 当前点击回复的评论项
      currentComment: {}
    }
  },

  created() {
    this.loadArticle()
    console.log('currentComment', this.currentComment)
  },

  methods: {
    async loadArticle() {
      this.loading = true
      try {
        const { data } = await getArticleById(this.articleId)
        console.log(data)
        this.article = data.data
        setTimeout(() => {
          this.previewImage()
        })
      } catch (error) {
        // console.log('获取数据失败', error)
        if (error.response && error.response.status === 404) {
          this.errStatus = 404
        }
      }
      // 无论成功还是失败，都需要关闭 loading
      this.loading = false
    },

    // 封装 ImagePreview 预览图片方法
    // 预览图片
    previewImage() {
      // 得到所有的 img 节点
      const articleContent = this.$refs['article-content']
      const imgs = articleContent.querySelectorAll('img')
      const images = []

      imgs.forEach((item, index) => {
        images.push(item.src)

        item.onclick = () => {
          ImagePreview({
            images: images,
            startPosition: index
          })
        }
      })
    },

    // 处理评论
    onPostSuccess(data) {
      // 关闭弹出层
      this.isPostShow = false
      this.totalCommentCount++
      // 将发布的内容展示到列表顶部
      this.commentsList.unshift(data.new_obj)
    },

    // 声明 onReplyClick 事件处理程序，让弹出层显示
    onReplyClick(comment) {
      console.log(comment)
      // 显示评论回复弹出层
      this.isReplyShow = true
      // 将数据传递给data里面到的 currentComment
      this.currentComment = comment
    }

    // // 关注和取消关注
    // async onFollow() {
    //   // 开启关注和取消关注加载loading
    //   this.followLoading = true
    //   try {
    //     if (this.article.is_followed) {
    //       // 已关注，取消关注
    //       await deleteFollow(this.article.aut_id)
    //     } else {
    //       await addFollow(this.article.aut_id)
    //     }
    //     // 这里是为了本地能看到关注和取消关注的效果效果
    //     this.article.is_followed = !this.article.is_followed
    //   } catch (error) {
    //     let message = '操作失败，请重试'
    //     if (error.response && error.response.status === 400) {
    //       message = '你不能关注你自己！'
    //     }
    //     this.$toast(message)
    //   }
    //   // 开启关注和取消关注加载loading
    //   this.followLoading = false
    // }
  }
}
</script>

<style scoped lang="less">
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
